SEI was started in Campbell, California in 1990 and is a division of Senah, Inc., a California corporation. SEI is dedicated to serving the growing number of requirements for lower priced production quantities of higher frequency microwave components and connectors as well as increasing the availabilityof the more standard products.
About Aluminum Castings
SEI also does aluminum/zincdie casting and offers a unique combination of capabilities producing product in die cast aluminum and zinc alloys,there area number of “standard” enclosures on website: seicastings.com
See their site here seimw.com/